Luminescence of (YxGd3−x)(AlyGa5−y)O12:Ce and (LuxGd3−x)(AlyGa5−y)O12:Ce Radiation-Synthesized Ceramics

(YxGd3−x)(AlyGa5−y)O12:Ce and (LuxGd3−x)(AlyGa5−y)O12:Ce ceramics were synthesized for the first time by direct exposure of a powerful electron flux to a mixture of the corresponding oxide components. Five-component ceramics were obtained from oxide powders of Y2O3, Lu2O3, Gd2O3, Al2O3, Ga2O3, and Ce2O3 in less than 1 s, without the use of any additional reagents or process stimulants. The average productivity of the synthesis process was approximately 5 g/s. The reaction yield, defined as the mass ratio of the synthesized ceramic to the initial mixture, ranged from 94% to 99%. The synthesized ceramics exhibit photoluminescence when excited by radiation in the 340–450 nm spectral range. The position of the luminescence bands depends on the specific composition, with the emission maxima located within the 525–560 nm range. It is suggested that under high radiation power density, the element exchange rate between the particles of the initial materials is governed by the formation of an ion–electron plasma.